Light-focusing apparatus



Dec. 15 1925' LIGHT FOCUSING APPARATUS 2 Sheets-Sheet 1 Filed June 1922m N'EI Inventor Cromwell A. Blialvorson din,

His Aitorney.

Dec 15, 192 v.

c. A. B. HALVORSON, JR

LIGHT FOCUSING APPARATUS 1922 2 Sheets-Sheet 2 Filed June 50 Inventor:

Cromwe1lA.B.Ha1vorson m by Ma /Q Patented Dec. 15, 1925,

UNITED STATES PATENT OFFICE.

CBOMWELL a. B. nanvonson, 3a., or LYNN, massacnusnrrs, assrsnon 'ro enn-ERAL nnacrmc GOMBAN/Y, A CORPORATION or NEW YORK.

LIGHT-FOCUSING API 'ARATUS.

Application filed June 30, 1922. Serial No. 571,966.

To all whom it may concern Be it known that I, CROMWELL A. B. HALvonsoN,Jr., a citizen of the United States, residing at Lynn, county of Essex,

5 State of Massachusetts, have invented certain new and usefulImprovements in Light- Focusing Apparatus, of which the following is aspecification.

My invention relates to the method of 1 and means for adjusting thesourceot light. for a projector and for rapidly replacing one source foranother or a defective one for a non-defective one and insure-that thenew source will instantly find its proper position in the opticalsystem.

Motion picture machines and the like whichhave made use of an arc-lightfor projection are now, in a great many instances, using incandescentlamps instead and as is well known the filament of such lamps breaksfrom time to time and unless some provision is made for quickreplacement, annoying delay results. results from the fact that thefilament of such lamps must be accurately positioned with respect to theoptical system and since no two lamps have their filam'entin the sameplace, each individual lamp must be adjusted to bring its filament intoproper position. Heretofore meanshave-been devised which involve the useof a removable lamp socket which ma y be withdrawn as a' whole with theinjured lamp just as a drawer is removed from its pigeon hole. Thecircuit for the socket is closed by way of the beariugs when the socketis slipped into place. Upon cursory consideration it might be thoughtthat if the lamp is adjusted with respect to the socket up and down; andthe socketback and forth in the adapter; and from right to the left thatthis would supply all the adjustment necessary to bring the filamentinto proper position; but when it is considered that, the amp issometimes tilted it will be realized that the lamp as a whole must betiltedback to bring the filament into position. And that. is not all.Provision must also be made for rotating the filament about the majoraxis of the lamp to bringthe plane of the filament at right angles tothe major axis of the rojector thereby presenting the greatest width ofthe filament to the condenser lens.

The delay lamp setting equipment has been provided heretofore but whichdoes not provide for the adjustment of the lamp by tilting it until .thefilament plane is brought into proper position. 'Nor do they provide inaddition means for adjusting the filament up and down. In any event thedevices ol the prior art are cumbersome and comphcated being providedwith reflecting mirrors and pivotal structures.

It is another object of my invention to provide a lamp setter oradjuster devoid of all such complications and which at the same timeprovides for all the adjustments above indicated. By the provision ofsuch an adjuster, the attendant may, while the motion picture machine isin operation, set in readiness a number of lamps for immediate use inthe event that the lamp in operation burns out. Such adjustments, ofcourse, can be just as conveniently made before the picture machine isstarted in operation. Inany event, it is more convenient to use the lampsetter than it is to adjust the lamp in the lamp housing.

I also. provide other details of improvement tending to increase theefiiciency and serviceability of devices of the above character.

The means by which the above ends are accomplished are hereinafter morefully set fortlrand claimed, reference being bad to the accompanyingdrawin s.

In the drawings, Fig. '1 is a perspective view of the lamp setter openedto receive a lamp and socket. In this figure the socket is also shown toone side with the lamp in position. .Fig. 2 is a section in elevationthrough the socket; Fig. "3 is a section through the projector housingshowing the adapter and socket in osition; Fig. 4 is a section of thesocket ut taken at right angles to the section of Fig 2;, Fig. 5 is atop view of the adapter; ig. 6 is a Side view of the same; Fig. 7 1s aside View of.

the lamp in the socket.

Referring more 1n detail to the drawings the socket, Figs. 2, 3 and 4,has a base 2.

On the under side of the base there are two metallic contact strips 3and 4, one on each side, which are ordinarily about or 3/; of an inchwide and from 1 to 1 inches long and these strips have metallicconnections'as shown in Fig. 4 with metallic tenninals 5 and 6respectively which are engaged by the terminals of the lamp. Theterminal 6 as shown is the central terminal under which there is anadjusting set screw 7 for regulating the height of the terminal (3: theouter terminal 5 is made up of three sections a, F) and a. The sectionsa and b are closed metallic rings whichare held together by means ofbolts 7 and 8. It will be observed that the elements a, b and 0 form auniversal joint structure, the element c having its upper and lower rims9 and 10 chamlered. The elements a and b are-prm ided with correspondingsloping surfaces 11 and 12. It will be observed that element 0 is in theform of a split ring. The lamp 13 may be an ordinary Mazda motion icturelamp. The dotted lines in Fig. 2 indicate how the lamp is held betweenthe split ring 0 and the in nor terminal 6. Obviously, therefore, thelamp 13 may be tilted in any direction and tightly clamped by screwingthe bolts 7 and l n 8 WlllCll of course compresses the ring 0 againstthe lamp terminal in the socket.

In the base 2 (Fig. 1) there is a set screw 14 for adjusting the socketwith respect to the adapter 15 (Fig. 5) or with respect to the base ofthe lamp setter (Fig. 1). The adapter also has an adjusting screw 16which has a circular groove at the neck of the screw that is engaged bythe heel adjusting hecl plate 17. This heel plate may be set forward orback to any desired extent and clamped in such position by means of thenut 18. On the surface of the adapter there is provided a pair ofmetallic contact plates 19 and 20 to which the source of current supplymay be connected. These contacts are engaged by the metallic strips 3and 4 on the under side. of the base 2 (Figs. 1 and 4), when the base isslipped in place on the adapter as shown in Fig. 7. Thedistance that thebase can he slid in the groove on the adapter and on the holder setter,as will appear, is determined by the head of the screw 14, (Fig. 7). Thegroove for the base is formed by the bottom and sides of the adapter andby the top stri s 21 and 22 that are screwed to the top 0 the holder, asimilar construction a pearing on the holder, (Fig. 1) It it is oundthat the lamp is set too far to the left (Fig. 7) it may be broughttoward the right by turning the screw 14 clockwise; or it may be setfurther back, to the left, by

aceaaeo? pressing the socket back1mtil-the screw head strikes the heelplate 17. Obviously therefore by means of screws 14fand'7 (Figs. 7

4 and 7) thelamp may beset upor down and to the right or to the left(Fig.7).

Referring to Fig. 2, it will beseen that, in

the set screw 7 there is a helical spring 23 (see also Fig. 4) locatedbetween this screw 7 and theterminal 6, wh'ichspring serve; to make thecontact 6 a yieldingcont'acts:

that the lamp may be. rotated or tilted l. the socket without breakingtheelcctrical connection. This contact 6 has a down wardly projectingneck on the lower end of which there is a head terminal. The object ofthe head terminal is to prevent the spring 2?, from throwing theterminal out of position when the lamp is removed. it will he observedthat on one side of the groove in the adapter (Fig. 5) there is a spring25 that maintams the socket snugly against the opposite side of thegroove and which serves to prevent-any play of the socket in theadapter.

It now remains to consider the lamp setter (Fig. 1). This setter may bemade in the form of a metallic frame 24. It is provided with a groovesimilar to that provided in the adapter which groove is also for thepurpose of receiving the lamp holder. To one side of this groove in thesetter there is a spring 26 which also serves to take up any loose playbetween the socket and the setter frame and which therefore correspondsto the spring 25 (Fig. 5;). On the upper side of the setter there is ahorizontal strap arm 27 which is hinged as indicated and on the oppositeside of the frame from the hinge there is a latch spring 28 which isused to latch arm 27 to imprison the lamp 13 when the socket 5 is in thelam setter. In the frame opposite the arm 27 tliere is a V slot 29 and acorresponding V slot 30 in the arm 27 located diametrically opposite,which slots serve for sighting the filament to bring it into a. givenosition with respect to the setter frame. i lso on the sides of theframe there are rovided a pair of windows, each opposite the other andeach having ahorizontal ledge from which the pins 31 and 32 project asshown. These pins and the ledges from which they rise serve for sightingthe filament to place it in proper position with j respect to the setterframe. It will be understood that the line of sight between the '32. Bymeans of these set screws the lamp 13 may tilted in either the V sightplane or in the pin sight plane, On the inside-of the hinge arm 27 Ihave provided a tension spring which is so set as to press the lamp 13toward either of the set screws33 or 34 and which therefore serves tomaintain the lamp against these set screws when socket and lamp are setin the lamp setter; Now it is to be understood that'the intersection ofthe V sight axis with the pin sight axis 10- cates azpoint' which wewill call the 0 tical point of the setter and which point asa peculiarrelationto the'point in the actual optical system, which" latter pointwe will,

-'call thea'ctual optical point,;'and with respect to which latterthe-filament-should be properly set in'the lampjhousingt This relaj- 1tion is such that if the filament isset in the setter in a givenposition relative to the set: 'ter 'opticalfpoint, then when the baseand lamp are transferred to the adapter in the lamp housing, thefilament will be placed in the same relative position to the actualoptical: point and viceversa. In order to obtain this relation thealtitude of the setter optical.

pointiabove the holder is identical with the altitude of the actualoptical point above the adapter in the housing. Therefore, it is ob- Ivious that with my inventionany number of lamps may be adjusted withrespect to their sockets and with respect to the optical point of thesetter so that a lamp may be replaced in a moment in its proper opticalrelation to the actual optical system the instant that the ment withreference to/the other;

It wi'llbe seen that without the sighting elements on opposite sides ofthe setter, Fig. 1, it would not be possible to effectively determinewhether the filament ofthe lamp 13 is at the proper height, One sightingelement alone would be insufiicient to determine accurately the correctheight of the filament.

It will be seen further. that the filamentniay -be adjusted not only intwo planes at rightangles to each other but also up and down withrespect to the base 2, by means of the screw 7 and further along a linein theone plane parallel to the other plane or along the line ofintersection of the two planes. I With the means that 'I provide amotion picture device maybe maintained in eflicient operation, with one,lamp setter, two-bases,

and two sockets since while the motion picture machlne is operating} alamp may be adjusted and made ready for instant use in case the lamp inuse burns out.

While I have shown and disclosed myinr vention in 'conn'ectionwith aspecific form of construction it will be understood that I do not wishto be limited to this form inasmuch as in view of the disclosurevariations ofmy invention may readil suggest themselves to others whichwould all within the scope of the claims appended hereto; 7 7

,What 'I claim'as newand desire to secure by Letters Patent of-theUnited States is 1. The combinationofa-lamp setter with a lamp and auniversal joint socket'for the lamp whereby the lamp maybe tilted. inthe setter along either of two intersecting lanes and mechanicalmeansfor raising or 'owering the lamp within the socket;

2. In combination with alamp settera lamp, a ball andsocket joint andmeans forbindin'gsaid lamp to said ball and socketafter the lamp hasbeen set through the medium of said setter and mechanical means forraising or lowering the lamp the. V

socket.

lamp, a ball and socket lamp hol er in said setter for. setting saidlamp vby tiltin the" lamp in said holder'alongeith'er 0 two intersectingplanes and mechanical means for raising or loweringthe lampwithin thesocket.

3. In combination'with a lam setter, at

4. In combinationwith a 'lainpi'setterya" lamp, a balland socket lampholder in said setter for setting said lamp by tilting lamp in saidholder along-either of two inter;

the

'sectmg planes and. meanslonsaid setter for tilting said lamp, and meanson"the=s'etter-.

for determinin the proper adjustment of the lamp in said planes. l

5. In combination with an optical system,

a; lamp, mounting means for saidflamp, v means for moving the lampin'onedirectlom.

means for moving the lamp at rightangles thereto means for rotating the"lamp inone right angles to thefirst plane.

6. In combination with an optical system, a lamp, mounting means forsaid lamp, means for moving the lamp in one direction, means for movingthe lamp'vatright angles thereto, means for rotating the lamp in oneplane'and means for rotating the lamp at plane and means for rotatingthe lamp at means involving a lam I setter.

7. In combination wlth an optical system, a lamp mounting means for saidlamp, means for moving the lamp in one direction, means'for moving thelamp at right angles thereto, meansffor rotating the lamp in one rightangles to the :first plane, said last plane and means for rotating thelamp at thereto, means for rotating the lamp in one plane and means forrotating the lamp at right angles to the first plane, said last meansinvolving a lamp setter, said lamp setter including a lamp holder andincluding sights for determining how much the lamp is moved in anydirection.

9. The combination of a lamp setter, a lamp socket and an electric lamp,the socket comprising a universal joint, means on the setter foradjusting the lamp in either of two planes While thebase of the socketremains stationary.

10. A lamp setter comprising a frame provided with sighting elements intwo intersecting planes, a carriage mounted to slide in said frame, alamp socket upon said carriage comprising a universal joint adapted toreceive a lamp and adapted to permit the lamp to be tilted along eitherof two intersecting planes, and means associated with said socket forraising or lowering the lamp withinthe socket.

11. A lamp setter comprisinga frame provided with sighting elements intwo inter secting planes, a carriage mounted to slide in saidframe, alamp socket upon said can riage comprising a universal joint adapted toreceive a lamp and adapted to permit the lamp to be tilted along eitherof two intersecting planes, means associated with said socket forraising or lowering the lamp within'the socket, and micrometer means forad justing the carriage.

In Witness whereof, I have hereunto set my hand this 28th day of June,1922.

CROMWELL A. B. HALVORSQN, JR.

